1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Arte-miy333 [17]
2 years ago
15

A posição de um veículo no trecho reto de uma estrada, durante um certo tempo e a partir de um estabelecido referencial, tem a s

eguinte forma: S = – 4,0 + 40t (no MKS). Pode-se afirmar que:
a) Seu movimento é retrógrado.



b) Sua aceleração centrípeta é nula.



c) Ele inverte o sentido de movimento em t = 16 s.



d) Ele passa na origem dos espaços no instante t = 80 s.
Physics
1 answer:
Mariulka [41]2 years ago
4 0

Answer:

b) Sua aceleração centrípeta é nula.

Explanation:

a)

Movimento Retrógrado é o movimento descrito por um móvel cujo movimento vai  percorrendo em sentido contrário ao da reta.

É descrito matematicamente por uma função linear <u>decrescente</u>.

Analisando a função abaixo, percebe-se que esse movimento não é retrógrado. Haja vista, ser esta função crescente uma vez que o sinal da constante "v" é positivo.

S=-4+40t

Vamos testar para verificar

S=-4+4(1) \therefore S=0\\S=-4+40(2) \therefore S=-4+80 \therefore S=76 m\\S= -4 +40(3) \therefore S=-4+120 \therefore S=116 metros

b)

A Aceleração centrípeta está diretamente ligada ao Movimento Circular, podemos calculá-la por

a_{cp}=\frac{v^{2}}{R}

Como a função S=-4+4t descreve um movimento linear, sua aceleração centrípeta é nula, pois não há Movimento Circular sendo executado pelo móvel. Assim, não há Raio

Logo:

c)  Para que houvesse inversão de sentido, o valor de S teria que ser negativo. Fazendo a substituição vemos que isso não ocorre:

S=-4+40*16\\S=-4+640\\S=636 m

You might be interested in
The density of mercury is 13.6 g/ml. what is its density in lbs/L
solong [7]

Answer:

can u send a picture to identify it

Explanation:

sorry I just need point:/

4 0
3 years ago
The vector values are 4.0 km due East and 3.0 km due north the resultant vector is 5.0 km long and 37 north of East this values
klemol [59]

Answer:

This values shows a right angle triangle

Explanation:

Given;

a vector 4.0 km due East

a 3.0 km due north

the resultant vector is 5.0 km

The resultant vector can be obtained by Pythagoras theorem if the vectors form a right angle triangle.

R² = 4² + 3²

R² = 16 + 9

R² = 25

R = √25

R = 5 km    (right angle triangle proved)

Therefore, this values shows a right angle triangle

4 0
3 years ago
Two cars are raised to the same elevation on service- station lifts. If one car is twice as massive as the other, how do their p
Brums [2.3K]

Answer:

The potential energy of the more massive one is twice that of the other.

Explanation:

Potential energy is given by

<em>PE</em> = <em>mgh</em>

where <em>m</em> = mass of body, <em>g</em> = acceleration of gravity and <em>h</em> = height or elevation.

For the less massive car, let the mass be m_1. Then its <em>PE</em> is

PE_1 = m_1gh

For the massive car, let the mass be m_2.  Its <em>PE</em> is

PE_2 = m_2gh

But m_2 =2m_1

\therefore PE_2 = 2m_1gh = 2(m_1gh) = 2PE_1

Hence, the potential energy of the more massive one is twice that of the other.

7 0
3 years ago
1. A Faraday ice pail similar to the one you will use in the experiment is used in this question. The principle of its operation
algol [13]

Answer:

your mommy

Explanation:

YOUR MAMMA

YOUR MAMMA

I LOVE MY DADDY

HE DOES ME REAL HARD

8 0
3 years ago
A stone that starts at rest free falls for 7.0 s. How far does the stone fall in this time?
vredina [299]

Gravitational acceleration is approx 9.8 m/s
Time is 7s

a=9.8 m/s
t=7s

a = d/t^2

therefore:

d = a * t^2

d = 9.8 * 7^2

d = 9.8 * 49

d = 480.2 [m]

7 0
3 years ago
Other questions:
  • A representation of a chemical reaction that uses symbols to show the relationship between the reactants and the products is cal
    6·2 answers
  • Which acceleration graph corresponds to the pressure graph shown?
    13·2 answers
  • A certain amount of a monatomic gas is maintained at constant volume as it is cooled by 50K. This feat is accomplished by removi
    8·1 answer
  • A particle of mas 0.1 kg moves along the trajectory x(t)-3t t where x is in meters and t is in seconds. What is the kinetic ener
    8·1 answer
  • When we say "muscle" - the ones that show how strong you are, we are referring to what kind of muscles?
    11·2 answers
  • If the temperature of the solar surface is 5800 K and Wien's law for the peak wavelength of the spectrum of the Sun, assumed to
    7·1 answer
  • Please help!!!! Will mark brainliest.
    8·1 answer
  • What is the atomic number of an atom?
    9·1 answer
  • discuss four contributing factors that may lead to an increase of learners abusing substance in scools​
    8·1 answer
  • Why is it difficult to define abnormal behavior?
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!